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Across 1. The scientific term for the Abyssal Zone. 3. The best defense mechanism for most deep sea creatures. 5. The scientific term for the Hadal Zones. 10. The mythological Kraken is one of these. 13. The reason why humans cannot explore the deep seas. 14. A creature's ability to use artificial light. 16. An excess chemical created in the process of bioluminescence. 17. A cephalopod that can transform into a spiky ball. 18. The skin of the giant tube worm.

Down 1. A good example of a user of bioluminescence. 2. The "producers" of deep marine food pyramids. 4. The deepest trench on Earth. 6. The term commonly used to describe the deepest hadal zones. 7. The life-giving "suns" of the deep sea. 8. The primary consumers of the deep. 9. The Greek god affiliated with Hadal Zones. 11. A giant squid's favorite meal. 12. The other chemical used in the process of bioluminescence. 13. A small organ that can produce light (found on vampire squid). 15. One chemical used in the process of bioluminescence.